I can not play Minecraft. A certain style of first-person camera, usually in older games, but also in games using older 3D engines, causes me video game motion sickness. Yes, I can see that Minecraft is an incredibly creative sandbox game, but as I can't play it, I'm not really qualified to write a lot about it. Sorry.
There is excellent coverage of the game elsewhere, e.g. at Killed in a Smiling Accident.